Picking correct sash weight range

Question

I need the 22" series 390 channel balance but I do not know which stamp option to select. The writing on my current balance says "21 11 of BSI." Please help!

User submitted photos of a window balance.

Paul · Accepted Answer

For your stamped marking of "21 11" on your balance, you would go with our 2165 option holding a sash weight of 30-34 pounds.